Under your clothes
Yes. You should wear underwear!!
Wear pants over top of the underwear.
nothing wear your underwear
underwear
You should start by wearing hers.
Wear underwear fit to your body or not bunched in any areas. You don't need to get a wedgie while running or working out! All you need are regular underwear.
It will not harm you, doctors say you should wear loose underwear to increase your sperm.
boxers
Briefs
Thong.
Briefs
Yes. If they are sleeping at someone's house, and with their boyfriend or husband they should wear underwear under than pajama pants/shorts. They should always wear underwear under a night shirt/night grown, because it's just like wearing a dress.